Antthrushes are rotund creatures that walk along the forest floor with a bobbing gait. They have short tails that are usually cocked straight up. Black-headed is very dark overall, browner toward the rear with a blacker head. Also note the teardrop-shaped pale skin around the eye. Secretive and difficult to spot, although sometimes seen walking along forest trails. Far more often heard than seen. Listen for fast whistled song, a fairly long series of notes rising in pitch.